How do you handle errors in Express?
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Error handling in Express.js is crucial for building stable and user-friendly applications. Express provides a built-in way to catch and respond to errors using middleware functions.
Basic Error Handling Middleware:
An error-handling middleware function has four parameters: err, req, res, next.
app.use((err, req, res, next) => {
console.error(err.stack);
res.status(500).send('Something went wrong!');
});
Creating and Throwing Errors:
You can throw errors manually in route handlers:
app.get('/', (req, res) => {
throw new Error('Manual error');
});
Or pass to next():
app.get('/error', (req, res, next) => {
const err = new Error('This is a custom error');
next(err);
});
Handling 404 Errors:
To catch unmatched routes:
app.use((req, res) => {
res.status(404).send('Page not found');
});
Using async/await with Try-Catch:
For asynchronous routes, wrap code in try-catch and pass errors to next().
app.get('/user', async (req, res, next) => {
try {
// some async logic
} catch (err) {
next(err);
}
});
Summary:
Error handling in Express is done using special middleware. Always include a 404 handler and a generic error handler to ensure your app responds gracefully in all situations.
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